Problem with calling a dll written in c - System.DllNotFoundException

  • Thread starter Thread starter pgugel
  • Start date Start date
P

pgugel

Hi!

I just got that Problem by calling a c-written dll - at runtime the
dll will not found: System.DllNotFoundException
I copied the dll in both project folders (debug/release), i imported
it into project-explorer and set property "copy always". I checked
methodname with dependens.exe - name is correct.
The documentation for the dll is:
Function Prototype :
extern "C" __declspec(dllexport) bool RHIO_SockConnect
(BYTE bAddr1, BYTE bAddr2, BYTE bAddr3, BYTE bAddr4,
int iPort);

I don't know the Problem???
I upload my vs-sample-project to: http://www.FastShare.org/download/SenaRHIO.zip

Here is my code that imports and calls a method:

Imports System.Runtime.InteropServices
Public Class Form1
<DllImport("RHIO_Proc.dll", EntryPoint:="RHIO_SockConnect")> _
Public Shared Function RHIO_SockConnect(ByVal bAddr1 As Byte,
ByVal bAddr2 As Byte, _
ByVal bAddr3 As Byte, ByVal bAddr4 As Byte, ByVal iPort As
Integer) As Boolean
End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) _
Handles Button1.Click
If RHIO_SockConnect(192, 168, 0, 10, 6001) Then
MsgBox("Connection successful!")
Else
MsgBox("Connection failed!")
End If
End Sub
End Class


Thanx for your help!
 
Hi!

I just got that Problem by calling a c-written dll - at runtime the
dll will not found: System.DllNotFoundException
I copied the dll in both project folders (debug/release), i imported
it into project-explorer and set property "copy always". I checked
methodname with dependens.exe - name is correct.
The documentation for the dll is:
      Function Prototype :
               extern "C" __declspec(dllexport) bool RHIO_SockConnect
               (BYTE bAddr1, BYTE bAddr2, BYTE bAddr3, BYTE bAddr4,
int iPort);

I don't know the Problem???
I upload my vs-sample-project to:http://www.FastShare.org/download/SenaRHIO.zip

Here is my code that imports and calls a method:

Imports System.Runtime.InteropServices
Public Class Form1
    <DllImport("RHIO_Proc.dll", EntryPoint:="RHIO_SockConnect")> _
    Public Shared Function RHIO_SockConnect(ByVal bAddr1 As Byte,
ByVal bAddr2 As Byte, _
            ByVal bAddr3 As Byte, ByVal bAddr4 As Byte, ByValiPort As
Integer) As Boolean
    End Function

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) _
        Handles Button1.Click
        If RHIO_SockConnect(192, 168, 0, 10, 6001) Then
            MsgBox("Connection successful!")
        Else
            MsgBox("Connection failed!")
        End If
    End Sub
End Class

Thanx for your help!
Click to expand...

Hi,
You may need your dll located in system32 or root windows folder ("c:
\windows\system32" or "c:\windows" folder").

Plus, with no confirmation, try to specify the exact path of dll if
location is fixed as DllImport's first argument:
Like:
' eg: if it's in c:\RHIO folder
<DllImport("c:\RHIO\RHIO_Proc.dll", EntryPoint:="RHIO_SockConnect")>
_

' .....rest is same.

That also can be useful for searching hierachy:
http://msdn.microsoft.com/en-us/library/ms682586.aspx

HTH,

Onur Güzel
 
Thanks for your comment, but after copy the dll to nearly everywhere
and testing to specify all the paths the Problem is still the same :(

Any other ideas?
 
Hi!

I got the solution! It was the dll-path:

<DllImport("RHIO_Proc.dll", EntryPoint:="RHIO_SockConnect")> ... do
not work
<DllImport("../RHIO_Proc.dll", EntryPoint:="RHIO_SockConnect")> ...
work fine

So a few dots and a line sometimes makes the different...
 
Hi!

I got the solution! It was the dll-path:

<DllImport("RHIO_Proc.dll", EntryPoint:="RHIO_SockConnect")> ... do
not work
<DllImport("../RHIO_Proc.dll", EntryPoint:="RHIO_SockConnect")> ...
work fine

So a few dots and a line sometimes makes the different...
Click to expand...

Glad you did it :)

Onur
 
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